CN219725105U

CN219725105U - Shell welding tool

Info

Publication number: CN219725105U
Application number: CN202321210151.0U
Authority: CN
Inventors: 李东成; 汤洪明
Original assignee: Suzhou Bapima Superconducting Technology Co ltd
Current assignee: Suzhou Bapima Superconducting Technology Co ltd
Priority date: 2023-05-18
Filing date: 2023-05-18
Publication date: 2023-09-22
Anticipated expiration: 2033-05-18

Abstract

The utility model discloses a shell welding tool, which comprises a first base plate, a supporting piece and a second base plate which are sequentially arranged in a stacked mode, wherein the first base plate is fixedly connected with the second base plate; the support piece comprises at least two sub-support plates which are distributed along the radial direction and are restrained between the first backing plate and the second backing plate; the expansion adjusting piece is used for pushing the sub-supporting plate to slide and expand along the radial direction until the sub-supporting plate is propped against the inner wall of the shell; and an avoidance groove is formed in the support piece at a position corresponding to the welding line of the shell. The utility model can inhibit or reduce welding deformation and improve welding quality, thereby improving the welding yield of the shell; and the quick positioning can be realized, and the welding tool is convenient to dismantle.

Description

Shell welding tool

Technical Field

The utility model belongs to the technical field of welding tools, and particularly relates to a shell welding tool.

Background

In the fabrication of semiconductor components (transistors, memory, wafer level packaging, etc.), many require high vacuum, high cleanliness or low temperature environments, where semiconductor cryopumps have significant advantages. The performance of the semiconductor cryopump is required to reach the standard, the semiconductor cryopump is stable and reliable, the appearance is required to be high, the thickness of the cryopump housing is required to be uniform, and the leak rate is required to be lower than 5E-12mbar L/S. The low-temperature pump shell is welded together by adopting a welding mode, and compared with a processing mode of stamping forming, the low-temperature pump shell has the advantages of low cost, short production period and the like.

Because straight section of thick bamboo and head all are the standard material of purchase, and there is certain deviation in the size, and the size deviation after the welding is often bigger, appears obvious step, and though follow-up through polishing can obtain level and smooth surface, but casing thickness has become inhomogeneous, influences structural strength, and the welding seam is polished, causes revealing easily, does not reach the leak rate requirement. Therefore, a welding tool is required to be designed, so that welding deformation can be restrained or reduced, welding quality is improved, and welding yield of the low-temperature pump housing is improved.

Disclosure of Invention

In view of all or part of the above-mentioned deficiencies of the prior art, the object of the present utility model is: the shell welding tool can inhibit or reduce welding deformation, and improve welding quality, so that the shell welding yield is improved; and the quick positioning can be realized, and the welding tool is convenient to dismantle.

In order to achieve the above object, the present utility model provides the following technical solutions:

the utility model provides a shell welding tool which comprises a first base plate, a supporting piece and a second base plate which are sequentially arranged in a stacked mode, wherein the first base plate is fixedly connected with the second base plate; the support comprises at least two sub-support plates distributed along the radial direction and restrained between the first base plate and the second base plate; the expansion adjusting piece is used for pushing the sub-supporting plates to slide and expand along the radial direction until the sub-supporting plates are propped against the inner wall of the shell; and an avoidance groove is formed in the support piece at a position corresponding to the welding line of the shell.

According to the utility model, the expansion adjusting piece pushes the sub-supporting plate to slide and expand along the radial direction, and when the side edge of the sub-supporting plate is propped against the inner wall of the shell, the support function is realized. The welding is carried out under the supporting effect, no step is generated, polishing is not needed, the thickness of the welded shell is uniform, and the structural strength is not influenced. Meanwhile, through the avoidance groove of the welding line, the rapid positioning of welding can be realized, and the welded welding line and the welding tool after welding cannot be adhered together, so that the welding tool is convenient to dismount. The welding fixture is used for positioning and supporting the workpiece, so that a large amount of surfacing materials caused by dislocation of the workpiece can be reduced, the quality of a welding line is improved, the welding line does not need to be polished, and the leakage rate requirement can be met. The utility model can inhibit or reduce welding deformation and improve welding quality, thereby improving the welding yield of the shell.

The expansion adjusting piece comprises a cone nut and an adjusting screw, the cone nut is arranged between at least two sub-supporting plates, and the adjusting screw penetrates through the second base plate and the cone nut which are matched with threaded holes; the surface of the cone nut is a conical surface, one end of the cone nut, which faces the second base plate, is a small-diameter end, and one end of the sub-supporting plate, which faces the cone nut, is provided with an inclined surface matched with the conical surface. Through locking and loosening of the adjusting screw, the cone nut can move up and down, so that the sliding expansion of the sub supporting plate is pushed, and the adjusting mode is simple in structure and easy to operate.

The guide pin penetrates through the second base plate and the cone nut which are provided with the positioning holes in a matching mode; the first backing plate is provided with a middle through hole, the aperture of the middle through hole is larger than the outer diameter of the large-diameter end of the cone nut, and the cone nut, the first backing plate and the second backing plate are coaxially arranged. The guide pin is used for limiting the rotation of the cone nut, and the cone nut is prevented from moving along the axial direction when the adjusting screw is locked or unlocked.

The first base plate and the second base plate are connected through at least two fixing screws; at least two sub-supporting plates are provided with waist-shaped holes along the radial direction, the positions of the fixing screws correspond to the positions of the fixing screws, and the fixing screws penetrate through the waist-shaped holes. The cooperation of set screw and waist type hole can inject the stroke scope of sub-backup pad, is convenient for welded quick location.

The whole support piece is in a circular shape and is equally divided into three sub-support plates, and the expansion adjusting piece is arranged in the circular middle of the support piece; the avoidance grooves on the three sub-support plates jointly enclose an annular groove. Namely, the sub-supporting plate is fan-shaped, the theoretical size of the inner wall of the shell is used on the whole circumferential surface of the supporting piece, and deviation exists in practice, so that the contact part of the sub-supporting plate and the shell is actually smaller, and the similar point contact is realized. Increasing the number of sub-support plates may increase the point contact.

The adjusting screw and the fixing screw are socket head cap screws, and a gasket is arranged between the head of the adjusting screw and the second backing plate. Compared with a common screw, the socket head cap screw is more convenient to adjust.

The first backing plate, the second backing plate and the cone nut are made of carbon steel, and the supporting piece is an aluminum plate. The support piece is made of aluminum plates, so that the strength is enough, and the workpiece can be prevented from being scratched.

The welding method is particularly applicable to welding of the low-temperature pump shell. The low temperature pump housing has higher requirements for structural strength and leak rate.

The low-temperature pump housing comprises an end socket and a cylinder body, the end socket and the cylinder body are sleeved on the outer side of the housing welding tool, the supporting piece abuts against the end socket and the cylinder body under the pushing action of the expansion adjusting piece, and the avoidance groove corresponds to the position of the welding seam. The support piece of the shell welding tool simultaneously supports the cylinder (straight cylinder) and the sealing head of the low-temperature pump shell.

Compared with the prior art, the utility model has at least the following beneficial effects: the expansion adjusting piece pushes the sub supporting plate to slide and expand along the radial direction, and when the side edge of the sub supporting plate is propped against the inner wall of the shell, the supporting function is achieved. The welding is carried out under the supporting effect, no step is generated, polishing is not needed, the thickness of the welded shell is uniform, and the structural strength is not influenced. Meanwhile, through the avoidance groove of the welding line, the rapid positioning of welding can be realized, and the welded welding line and the welding tool after welding cannot be adhered together, so that the welding tool is convenient to dismount. The welding fixture is used for positioning and supporting the workpiece, so that a large amount of surfacing materials caused by dislocation of the workpiece can be reduced, the quality of a welding line is improved, the welding line does not need to be polished, and the leakage rate requirement can be met. The utility model can inhibit or reduce welding deformation and improve welding quality, thereby improving the welding yield of the shell.

Drawings

In order to more clearly illustrate the technical solutions of specific embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

Fig. 1 is a schematic structural diagram of a shell welding tool in embodiment 1;

FIG. 2 is a cross-sectional view of the case welding tool in example 1;

fig. 3 is a schematic diagram of a semiconductor cryopump using a housing welding tool in embodiment 2.

Reference numerals: 1-a first backing plate; 2-a support; 21-a sub-support plate; 211-waist-shaped holes; 3-a second backing plate; 4-fixing screws; 5-an expansion adjustment; 51-cone nut; 52-adjusting the screw; 53-guide pins; 6-avoiding grooves; 7-end socket; 8-a cylinder.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully, and it is apparent that the embodiments described are only some, but not all, of the embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, in order to describe the technical solution more specifically, the steps described in the present embodiment do not strictly correspond to the steps described in the summary of the utility model.

Example 1

A shell welding tool, referring to fig. 1 and 2, comprises a first base plate 1, a supporting piece 2 and a second base plate 3 which are sequentially stacked and installed, wherein the first base plate 1 and the second base plate 3 are fixedly connected; in the present embodiment, the first shim plate 1 and the second shim plate 3 are connected by at least two fixing screws 4. The fixing screw 4 is an inner hexagon screw, which is more convenient to adjust than a common screw. The first backing plate 1 and the second backing plate 3 are made of carbon steel. The support 2 comprises at least two sub-support plates 21 radially distributed and constrained between the first and second pads 1, 3; in the present embodiment, the support member 2 is in the shape of a circular ring as a whole, and is equally divided into three fan-shaped sub-support plates 21, the center portion of which is designed with a tapered hole. In other embodiments more or fewer sub-support plates 21 are possible. The sub-supporting plate 21 is made of aluminum plate, has enough strength and can avoid scratching the workpiece.

An expansion adjusting member 5 is further included for pushing the sub-supporting plate 21 to slidably expand in the radial direction until abutting against the inner wall of the housing. The expansion adjusting member 5 is installed in the annular middle portion of the supporting member 2, i.e., in the tapered hole, and pushes the sub supporting plate 21 to slidably expand in the radial direction by the expansion adjusting member 5, and the first and second backing plates 1 and 3 serve to restrain the sub supporting plate 21 such that the sub supporting plate 21 can only expand outward or contract inward. In the present embodiment, the expansion adjusting member 5 includes a taper nut 51 and an adjusting screw 52, the taper nut 51 being installed in the taper hole between the three sub-supporting plates 21, the adjusting screw 52 penetrating through the second backing plate 3 and the taper nut 51 which are provided with screw holes in a matching manner; the surface of the cone nut 51 is a conical surface, the end facing the second backing plate 3 is a small diameter end, and the end of the sub-support plate 21 facing the cone nut 51 is provided with a bevel surface matched with the conical surface (namely, the central part of the whole support 2 forms the conical hole). By locking and loosening the adjusting screw 52, the cone nut 51 can move up and down, so that the sliding expansion of the sub supporting plate 21 is pushed, and the adjusting mode has a simple structure and is easy to operate. The adjusting screw 52 is an inner hexagon screw, and a gasket is arranged between the head of the adjusting screw 52 and the second backing plate 3. The cone nut 51 is made of carbon steel.

The first backing plate 1 is provided with a middle through hole, the aperture of the middle through hole is larger than the outer diameter of the large-diameter end of the cone nut 51, and the cone nut 51 is coaxially arranged with the first backing plate 1 and the second backing plate 3. The guide pin 53 is penetrated through the second base plate 3 and the cone nut 51 which are provided with positioning holes in a matching way; the guide pin 53 serves to limit the rotation of the cone nut 51, preventing the cone nut 51 from moving in the axial direction as it is locked or unlocked by the adjusting screw 52. At least two sub-supporting plates 21 are provided with waist-shaped holes 211 along the radial direction, and the positions of the fixing screws 4 are corresponding to the positions of the fixing screws 4, and the fixing screws 4 penetrate through the waist-shaped holes 211. The cooperation of the fixing screw 4 and the waist-shaped hole 211 can limit the travel range of the sub-supporting plate 21, so that the rapid positioning of welding is facilitated.

The support member 2 is provided with avoidance grooves 6 corresponding to the welding seam positions of the shell, and the avoidance grooves 6 on the three sub-support plates 21 in the embodiment jointly enclose an annular groove. The annular groove can realize quick positioning of welding, and the welded seam and the welding tool can not be adhered together after welding, so that the welding tool is convenient to dismount.

Example 2

The application of the shell welding tool in the embodiment 1 in the vacuum or low-temperature field can be particularly applied to the welding of a low-temperature pump shell, and the low-temperature pump shell has higher requirements on structural strength and leakage rate. In this embodiment, the semiconductor low-temperature pump housing is welded, referring to fig. 3, the low-temperature pump housing includes a seal head 7 and a cylinder 8 (straight cylinder), the seal head 7 and the cylinder 8 are sleeved outside the housing welding tool, and under the pushing action of the expansion adjusting piece 5, the supporting piece 2 abuts against the seal head 7 and the cylinder 8, so that the groove 6 is avoided corresponding to the position of the welding seam. The support of the shell welding fixture is simultaneously supported to a cylinder 8 (straight cylinder) and a seal head 7 of the low-temperature pump shell. The first pad 1 in the shell welding tool may be located above the second pad 3, or may be located below the second pad 3, in fig. 3, the case where the first pad 1 is located above the second pad 3 is illustrated, and in other embodiments, the shell welding tool may be turned upside down for use.

The principle of the utility model is illustrated by examples 1 and 2:

the cone nut 51 moves downwards to push the sub-support plate 21 to expand outwards in the radial direction by locking the adjusting screw 52, and the sub-support plate 21 abuts against the welding part of the seal head 7 and the cylinder 8, so that the welding line is positioned at the annular groove for welding. After the welding is finished, the adjusting screw 52 is loosened, the cone nut 51 moves upwards, the sub-supporting plate 21 loses the outward pushing force and is slightly adjusted, and the sub-supporting plate 21 can shrink inwards, so that the shell welding fixture is removed.

The above description of the embodiments is only intended to assist in understanding the method and core idea of the utility model. It should be noted that it will be apparent to those skilled in the art that various improvements and modifications can be made to the present utility model without departing from the principles of the utility model, and such improvements and modifications fall within the scope of the appended claims.

Claims

1. The shell welding tool is characterized by comprising a first base plate (1), a supporting piece (2) and a second base plate (3) which are sequentially arranged in a stacked mode, wherein the first base plate (1) and the second base plate (3) are fixedly connected; the support (2) comprises at least two sub-support plates (21) distributed radially and constrained between the first and second pads (1, 3); the expansion adjusting piece (5) is used for pushing the sub-supporting plates (21) to slide and expand along the radial direction until the sub-supporting plates are propped against the inner wall of the shell; and an avoidance groove (6) is formed in the support piece (2) at a position corresponding to the welding line of the shell.

2. A casing welding fixture according to claim 1, characterized in that the expansion adjusting member (5) comprises a cone nut (51) and an adjusting screw (52), the cone nut (51) being mounted between at least two of the sub-support plates (21), the adjusting screw (52) passing through the second backing plate (3) and the cone nut (51) being provided with threaded holes in a matching manner; the surface of the cone nut (51) is a conical surface, one end of the cone nut (51) facing the second base plate (3) is a small-diameter end, and one end of the sub-supporting plate (21) facing the cone nut (51) is provided with an inclined surface matched with the conical surface.

3. A casing welding fixture according to claim 2, further comprising a guide pin (53), said guide pin (53) passing through said second backing plate (3) and cone nut (51) with matching locating holes; the first backing plate (1) is provided with a middle through hole, the aperture of the middle through hole is larger than the outer diameter of the large-diameter end of the cone nut (51), and the cone nut (51) and the first backing plate (1) and the second backing plate (3) are coaxially arranged.

4. A casing welding fixture according to claim 2, characterized in that the first and second backing plates (1, 3) are connected by at least two fixing screws (4); at least two sub-supporting plates (21) are provided with waist-shaped holes (211) along the radial direction, the positions of the fixing screws (4) are corresponding to the positions of the fixing screws (4), and the fixing screws (4) penetrate through the waist-shaped holes (211).

5. A casing welding fixture according to any one of claims 1-4, wherein the support member (2) is circular overall, and is equally divided into three sub-support plates (21), and the expansion adjusting member (5) is mounted in the annular middle of the support member (2); the avoidance grooves (6) on the three sub supporting plates (21) jointly enclose an annular groove.

6. The shell welding fixture according to claim 4, wherein the adjusting screw (52) and the fixing screw (4) are socket head cap screws, and a gasket is arranged between the head of the adjusting screw (52) and the second backing plate (3).

7. The shell welding fixture according to claim 2, wherein the first backing plate (1), the second backing plate (3) and the cone nut (51) are made of carbon steel, and the supporting piece (2) is an aluminum plate.